ABAP Select data from SAP table SEQG1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SEQG1 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to SEQG1. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the SEQG1 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_SEQG1 TYPE STANDARD TABLE OF SEQG1,
      WA_SEQG1 TYPE SEQG1,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <SEQG1> TYPE SEQG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SEQG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SEQG1
  INTO TABLE IT_SEQG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SEQG1
*  INTO TABLE @DATA(IT_SEQG12).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_SEQG1 INDEX 1 INTO DATA(WA_SEQG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SEQG1 ASSIGNING <SEQG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SEQG1>-GNAME = 1.
<SEQG1>-GARG = 1.
<SEQG1>-GMODE = 1.
<SEQG1>-GUSR = 1.
<SEQG1>-GUSE = 1.

ENDLOOP.

LOOP AT IT_SEQG1 INTO WA_SEQG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SEQG1-GOBJ, sy-vline,
  WA_SEQG1-GCLIENT, sy-vline,
  WA_SEQG1-GUNAME, sy-vline,
  WA_SEQG1-GTARG, sy-vline,
  WA_SEQG1-GTCODE, sy-vline,
  WA_SEQG1-GBCKTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SEQG1 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_SEQG1 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_SEQG1 INTO WA_SEQG1.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_SEQG1_STR, 
GNAME TYPE STRING,
GARG TYPE STRING,
GMODE TYPE STRING,
GUSR TYPE STRING,
GUSE TYPE STRING,
GOBJ TYPE STRING,
GCLIENT TYPE STRING,
GUNAME TYPE STRING,
GTARG TYPE STRING,
GTCODE TYPE STRING,
GBCKTYPE TYPE STRING,
GTHOST TYPE STRING,
GTWP TYPE STRING,
GTSYSNR TYPE STRING,
GTDATE TYPE STRING,
GTTIME TYPE STRING,
GTUSEC TYPE STRING,
GTMARK TYPE STRING,
GUSETXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SEQG1_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_SEQG1_STR-GNAME sy-vline 
WA_SEQG1_STR-GARG sy-vline 
WA_SEQG1_STR-GMODE sy-vline 
WA_SEQG1_STR-GUSR sy-vline 
WA_SEQG1_STR-GUSE sy-vline 
WA_SEQG1_STR-GOBJ sy-vline 
WA_SEQG1_STR-GCLIENT sy-vline 
WA_SEQG1_STR-GUNAME sy-vline 
WA_SEQG1_STR-GTARG sy-vline 
WA_SEQG1_STR-GTCODE sy-vline 
WA_SEQG1_STR-GBCKTYPE sy-vline 
WA_SEQG1_STR-GTHOST sy-vline 
WA_SEQG1_STR-GTWP sy-vline 
WA_SEQG1_STR-GTSYSNR sy-vline 
WA_SEQG1_STR-GTDATE sy-vline 
WA_SEQG1_STR-GTTIME sy-vline 
WA_SEQG1_STR-GTUSEC sy-vline 
WA_SEQG1_STR-GTMARK sy-vline 
WA_SEQG1_STR-GUSETXT sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.